In this section
@article{Grinblat:2016:10.1021/acs.nanolett.6b01958,
author = {Grinblat, G and Li, Y and Nielsen, MP and Oulton, RF and Maier, SA},
doi = {10.1021/acs.nanolett.6b01958},
journal = {Nano Letters},
pages = {4635--4640},
title = {Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode},
url = {http://dx.doi.org/10.1021/acs.nanolett.6b01958},
volume = {16},
year = {2016}
}
TY - JOUR
AB - We present an all-dielectric germanium nanosystem exhibiting a strong third order nonlinear response and efficient third harmonic generation in the optical regime. A thin germanium nanodisk shows a pronounced valley in its scattering cross section at the dark anapole mode, while the electric field energy inside the disk is maximized due to high confinement within the dielectric. We investigate the dependence of the third harmonic signal on disk size and pump wavelength to reveal the nature of the anapole mode. Each germanium nanodisk generates a high effective third order susceptibility of χ(3) = 4.3 × 10–9 esu, corresponding to an associated third harmonic conversion efficiency of 0.0001% at an excitation wavelength of 1650 nm, which is 4 orders of magnitude greater than the case of an unstructured germanium reference film. Furthermore, the nonlinear conversion via the anapole mode outperforms that via the radiative dipolar resonances by about 1 order of magnitude, which is consistent with our numerical simulations. These findings open new possibilities for the optimization of upconversion processes on the nanoscale through the appropriate engineering of suitable dielectric materials.
AU - Grinblat,G
AU - Li,Y
AU - Nielsen,MP
AU - Oulton,RF
AU - Maier,SA
DO - 10.1021/acs.nanolett.6b01958
EP - 4640
PY - 2016///
SN - 1530-6992
SP - 4635
TI - Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode
T2 - Nano Letters
UR - http://dx.doi.org/10.1021/acs.nanolett.6b01958
VL - 16
ER -